Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?

A man was found murdered on Sunday morning. His wife immediately called the police. The police questioned the wife and staff and got these alibis: The Wife said she was sleeping. The Cook was cooking breakfast. The Gardener was picking vegetables. The Maid was getting the mail. The Butler was cleaning the closet. The police instantly arrested the murderer. Who did it and how did they know?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

What has no start, end, or centre?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

One night, a woman receives a call from the police. They tell her that her husband was murdered and that she should come to the crime scene as soon as possible. The woman drops the phone, shocked, and drives 20 minutes to the crime scene. As soon as she reaches the crime scene, the police arrest her and she is convicted of murder. How do the police know she committed the crime?